Process for injection molding of injection molded parts of plast

Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating...

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264108, 2643288, 26432812, 425573, B29C 4500

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active

049942204

ABSTRACT:
A process and apparatus for injection molding of injection molded parts of plasticized material, in particular plasticized liquid crystal polymers, in which the plasticized material is injected into the mold cavity of a closed injection mold having at least two spaced apart infeed gates, separate plastification and injection devices being associated with each of the gates. The plasticized material may be further injected into the mold cavity to compensate for any shrinkage during cooling of the molded material. Injection is carried out by at least one of the devices which causes the material to flow into the cavity via one of the gates associated therewith for filling the cavity and causing the material to partially flow from the cavity via the other of the gates in the direction of the other of the devices associated therewith.

REFERENCES:
patent: 2296730 (1942-09-01), Muller et al.
patent: 3331904 (1967-07-01), Friedman
P. S. Allen, M. J. Bevis, P.C. Emeanuwa and J. R. Gibson; Eliminating Weld Lines in Injection Moulding by Controlled Orientation; Plastics on the Road 1986; pp. 19/1-19/9; Dec. 3-4, 1986.
P. S. Allan and M. J. Bevis; Multiple Live-Feed Injection Moulding; Plastics and Rubber Processing and Applications; vol. 7, Nov. 1, 1987.
Engineering and Processing News; Modern Plastics International, p. 22, Nov. 1985.
P. S. Allan and M. J. Bevis; Multi Live-Feed Molding for Avoidance of Microporosity and for the Production of Specified Fibre Orientation and Distributions in Fibre Reinforced Materials; ICCM & ECCM; vol. 1; pp. 1.144-1.149.

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